this plugin will help you overcome the toolsets current limitations on painting and editing water at exterior maps.
WaterMill lets you create rivers, running down hills, or terraced ponds at deliberate levels - on the same tile! you can even create multiple overlapping water-surfaces, giving each it's own set of color, flow rate and directions...
a 13 pages pdf readme file explains the usage and some of the technics.
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latest versions can now be found here:
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10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone